[linux-dvb] Re: V4.0

[Johannes Stezenbach <js@convergence.de>]

Amudha@soc-soft.com wrote:
> 
>     Currently we are using DVB4.0, I have couple of doubts with respect
> to VBI header definition. Can anybody help me out with the usage of VBI
> attributes.
> 
> 1.	What is the use of enable attribute in struct dvb_vbi_wss and
> struct dvb_vbi_vps? What is the input expected for enable attribute?

enable == 0: WSS off (i.e. no data is inserted in VBI line 23)
enable != 0: WSS on

> 2.	We are extracting wss data unit from TXT PES and sending as
> input to ioctl. structure of  dvb_vbi_wss expects or takes only data
> unit. Whereas we get data unit and framefield data for reinsertion. But
> ioctl does not take any input for framefield. This framefield represents
> the field number for the VBI Line.

See ETSI EN 301 775 and ETSI EN 300 294.
WSS is in line 23, field_parity 1, thus there's no need to
have these parameters in the API.

> 3.	Do you have any plans to add new interface for setting VBI
> output channel?

I'm not sure if I understand what you mean. If you have more
than one video output encoders, you will have more than one vbi
device (so you can connect the right one to the appropriate
ts decoding feed of the demux).

HTH,
Johannes